Machine for reducing slag from iron-furnaces for fertilizing purposes.



- M. J. NORTHBROOKE. MACHINE FOR REDUCING SLAG FROM IRON FURNAGE$ FOR 7 PERTILIZING PURPOSES. APPLICATION PIL'ED FEB. 2s, 190a.

I am THE NORRIS PETERS ca, WASHINGTON, u. r;

' Patented Apr. 20, 1909.

UNITED: STATES PATENT orrro MARCUS J. NORTHBROOKE, OF NEW YORK,- N. Y.', ASSIGNOR TO INTERNATIONAL PHOSPHATE 00., A CORPORATION.

MACHINE FOR REDUCING SLAG FROM IRON-FURNACES FOR FERTILIZING PURPOSES.

T 0 all whom it may concern:

Be it known that LIVIAROUS J. NORTH- BROOKE, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Machines for Reducing Slag from Iron-Furnaces for Fertilizing Purposes, of which the following is a specification.

My invention relates to improvementsin methods or processes and machines for the manufacture of phosphate from the residue of molten iron furnaces, as the resultant slag thereof, which heretofore, so far as my knowledge extends, is allowed to be thrown away as waste, whereby said slag may be utilized for fertilizing purposes; and it consists in the steps for carrying out said process in connection with such machine involving the cutting action of knives mounted upon rolls or cylinders for reducing or pulverizing said slag in effecting its conversion for the in-' tended urposesubstantially as hereinafter more fully disclosed and ointed out by the subjoined description and claims.

In the accompanying drawings illustrating the preferred form of my machine, for aiding the carrying out of the invention, Figure 1 is a side elevation thereof with parts broken away disclosing more especially the knife or cutter equipped rolls or cylinders and adjunctive parts. Fig. 2 is an enlarged broken detailed end view showin in outline portions of the tworolls, the :nii'e or cutter of one roll and one of its clearance grooves being also disclosed; one of the clearance grooves of the opposed rollalso-being shown. Fig. 3 is a vertical section taken on the line :r.r of Fig. 2. duced on the line y y of Fig. 3.

In practicing my invention I provide a machine comprising principally a plurality of or numerous preferably steel rolls or cylinders 1, 1 mounted in a suitable frame-work 2 with their vundulatory or corrugated peripheries opposed to each other and equipped with numerous knives or cutters 3 arranged to cut in the plane of the axes of said rolls and standing out radially a short distance therefrom. The knives or cutters of the two rolls or cylinders pass through intersecting lines or circles during the conjoint rotation of V the latter, in order to effect a cutting or pulverizing action upon the slag or object fed between said rolls, as is apparent.

Specification of Letters Patent.

Application filed February 28, 1908.

Fig. 4 is a like section pro-' Patented April 20, 1909.

Serial No. 418,313.

I am aware that heretofore cylinders or rolls, having corrugated peripheries or surfaces but unequipped with cutters or knives have been employed for crushing purposes, but these do not answer my purpose of coinminuting or ulverizing slag in its cold state, as discarde at molten iron furnaces, as I have found by practical demonstration, for the effective conversion or reduction of the slag to the desired or requisite fineness for utilization for fertilizing purposes as practiced by me.

The knives or cutters 3 are formed of approximately pyramidal outline in cross-section and introduced from the end of the rolls into sockets or seats 3 extending parallel with the axes of said rolls and opening out through one end of the latter, but stopping a short distance inwardly from the opposite end of the rolls thus formingan abutment 3 at that end for the retention in place of the opposed end of the knife or cutter. The cutter introducing end of the groove is provided with a closure preferably in the form of a plate a let into a recess 1) formed laterally in the roll or cylinder for the retention of the closure itself from lateral displacement, it be ing held by screws 0, or other suitable fastenings, against'outward displacement, and accordingly securing the cutter or knife effectively in its seat or socket, and by which arshank-portions, with said points terminating in sharp edges as at cl for comminuting or pulverizing' the slag or object subjected to the action thereof, especially in treating the slag as noted. In the peripheries of the rolls or cylinders are also formed clearance grooves e arranged at points opposite the cutters or knives 3 for the reception of their points during the rotation of t e rolls or cylinders for obvious purposes or as implied by their designation for clearance of the cutters or knives. One of said cylinders or rolls has its shaft suitably journaled in pillow-blocks or bearings 5 of the frame-work 2 which is provided with lubricant-feeding cups 6, as usual. The other roll or cylinder is held yieldingly with relation to its fellow roll for obvious purposes by means of connected le ver-me1nbers, 7 suitably fulcru med upon the frame 2 and carrying in slots 8 therein bearings 9 between which are received the ends of the shaft or journal l of the roll or cylinder, said lever-members being subjected. to the stress or tension of resilient members or springs 10. Said members or springs are themselves held between slides 1 1, one adapted to transmit the pressure received thereon from said springs to said lever-members and the other slide being engaged. and held in place by the action of a screw 12, all of said parts being suitably arranged and supported in position in the frame 2 as shown.

A suitable hopper-member 13 is applied to the frame 2 to provide for the proper feeding of the slag or material to the pulverizing or comminuting rolls 1 as will be readily understood.

It will be readily seen that as the slag, fed in between the revolving knife or cutter equipped rolls or cylinders, is subjected to the cutting action of the knives thereof, said slag will be reduced or pulverized, suitably converting it for utilization for fertilizing purposes. By thus subjecting the slag to a cutting action, as opposed to a crushing action, it is found that its reduction is rendered more effective for the purposes of my invention.

I claim:

1. A machine of the character described, comprising opposed rollers having undulatory peripheries, the elevations thereof being equipped with cutters of general pyramidal outline, the valleys or hollows alternating with said elevations and having recesses for said cutters, said cutters having tapered points and their shanks flared from the base of said points laterally, and said elevations having sockets receiving and conforming to said shanks and extending parallel with the axes of said rollers and each socket having an end-Wall formed by a narrow portion of one side of the roller and the entrance end of said socket terminating a'short distance inwardly from the opposite side of the roller,

said entrance end of the socket having opposed or applied thereto a plate closure let into the side of the roller into contact with one end of the cutter.

2. A machine of the character described, comprising opposed rollers having undulatory peripheries, the elevations thereof being equipped with cutters of general pyramidal outline, said valleys or hollows alternating with said elevations and having clearance recesses for said cutters said elevations also having sockets extending parallel with the axes of the rollers and each having one end wall formed by a narrow portion of the roller at one side while the entrance end of the socket terminates at short distance inwardly from the opposite side of the roller, said entrance end of thesocket having op posed or applied thereto a plate-closure let into the side of the roller into contact with one end of the cutter.

3. A machine of the character described, comprising opposed rollers having their perimetrie surfaces provided with cutters arranged parallel With their axes, said cutters having tapered points and their shanks flared from the base of said points laterally and having broad flat inner ends, said rollers having sockets receiving and conforming to the outline of the shanks of said cutters and having a corresponding arrangement as said cutters to the r0ller-axes, each socket having one end-wall formed by a narrow-p0rtion of one side of the roller and the entrance-end of the socket terminating a short distance inwardly from the opposite side of the roller, a plate closure let into the side of the roller, in contact with one end of the cutter, and having its outer side flush with said side of the roller and its upper end stopping below the roller periphery and the point of the cutter.

In testimony whereof I allix my signature, in presence of two witnesses.

MARCUS J. NORTHBROOKE.

Witnesses CLARA Wnvenss, JOHN J. PHEELAN. 

